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Description

OpenClaw before 2026.3.28 accepts unbounded concurrent unauthenticated WebSocket upgrades without pre-authentication budget allocation. Unauthenticated network attackers can exhaust socket and worker capacity to disrupt WebSocket availability for legitimate clients.

PUBLISHED Reserved 2026-04-20 | Published 2026-04-28 | Updated 2026-04-29 | Assigner VulnCheck




HIGH: 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

HIGH: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem types

CWE-770: Allocation of Resources Without Limits or Throttling

Product status

Default status
unaffected

Any version before 2026.3.28
affected

2026.3.28 (semver)
unaffected

Credits

wang dong (@topsec-bunney) reporter

References

github.com/...enclaw/security/advisories/GHSA-f44p-c7w9-7xr7 (GitHub Security Advisory (GHSA-f44p-c7w9-7xr7)) vendor-advisory

www.vulncheck.com/...a-unbounded-pre-auth-websocket-upgrades (VulnCheck Advisory: OpenClaw < 2026.3.28 - Denial of Service via Unbounded Pre-auth WebSocket Upgrades) third-party-advisory

cve.org (CVE-2026-41399)

nvd.nist.gov (CVE-2026-41399)

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